# RMS analysis/measurement tool?

**URL:** <https://forum.audacityteam.org/t/rms-analysis-measurement-tool/39918>\
**Category:** Windows\
**Created:** [September 19, 2015, 6:10pm UTC](https://forum.audacityteam.org/t/rms-analysis-measurement-tool/39918 "2015-09-19T18:10:30Z")\
**Posts on this page:** 1\
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**Author:** ![DVDdoug](https://forum.audacityteam.org/user_avatar/forum.audacityteam.org/dvddoug/32/32925_2.png) [@DVDdoug](https://forum.audacityteam.org/u/DVDdoug)\
**Post date:** [September 19, 2015, 7:07pm UTC](https://forum.audacityteam.org/t/rms-analysis-measurement-tool/39918/2 "2015-09-19T19:07:06Z")

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The best free tool I know of is the [**[u]SoX[/u]**](http://sox.sourceforge.net/sox.html) stats command. But, SoX is a command line tool so it’s not quite as easy to use as Audacity.

You might try Steve’s [**[u]ReplayGain[/u]**](https://forum.audacityteam.org/t/replaygain/22589/1) plug-in. It can be used to find the relative _loudness_ of a file (not the same as RMS). The ReplayGain analysis gives you the recommended _change,_ so a louder file will give you a negative recommended dB change, and a quiet file will give you a positive recommended dB change, etc.

Adobe Audition has a similar feature, but it’s not free and it’s now a cloud subscription program. GoldWave ($60 USD) can be “tricked” into giving the RMS volume by running the Volume Match tool, which IMO is easier than Audacity’s Contrast analysis.

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